J. Mater. Sci. Technol. ›› 2025, Vol. 237: 54-67.DOI: 10.1016/j.jmst.2025.01.077

• Research Article • Previous Articles     Next Articles

Unveiling corrosion reaction mechanism of β-NiAl coating modified by platinum and hafnium in NaCl- or Na2SO4-containing mediums

Yiming Jianga,b, Shuai Lib, Di Huanga,b, Zebin Baoa,b,*, Jiemin Wanga,c,*, Shenglong Zhua,b, Fuhui Wangd   

  1. aSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    bShi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    cShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    dShenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
  • Received:2024-09-30 Revised:2024-12-14 Accepted:2025-01-21 Published:2025-12-01 Online:2026-01-08
  • Contact: *E-mail addresses: zbbao@imr.ac.cn (Z. Bao), jieminwang@imr.ac.cn (J. Wang) .

Abstract: Self-catalytic reactions have consistently been implicated in the high-temperature corrosion mechanism of NiAl-phase coatings in NaCl- or Na2SO4-containing mediums, with little discussion concerning the adsorption and competitive behavior of complex environmental molecules. This study investigated the adsorption and dissociation behavior of a series of gas-phase molecules (O2, H2O, SO3, S2, H2S, Cl2 and HCl) on the NiAl(110) surface using first-principles calculations. The findings reveal a mechanism of competitive adsorption and dissociation, with two distinct adsorption dissociation behaviors observed upon the introduction of Pt or Hf elements. Pt-doping inhibits the surface adsorption behavior of self-catalytic molecules, while Hf significantly enhances the adsorption and dissociation of oxygen-carrying molecules. By preparing three types of NiAl-phase coatings (β-NiAl, (Ni,Pt)Al, and Hf-(Ni,Pt)Al) and conducting corrosion tests in the presence of NaCl or Na2SO4, it is determined that the excellent corrosion resistance of Hf-(Ni,Pt)Al can be attributed to the combined effects of Pt in delaying corrosion reactions and Hf in promoting the formation of a protective oxide scale. A comprehensive analysis, combining first-principles calculations and experimental observations, was conducted to elucidate the corrosion mechanisms of three coatings in different corrosion mediums.

Key words: NiAl-phase coating, Self-catalytic reactions, First-principles calculations, Surface chemical behavior, Corrosion mechanism